GST Motorsports
04-25-2008, 09:21 PM
So today I did some extensive testing on some variations I had been messing around with of our EVO X - GST Open Filter Kit we will be releasing soon.
We had the car we did testing on before come in again. He had recently got the "Factory reflash" from Mitsubishi for the Evo X.
Here is a new baseline for this car. 100% stock, stock airbox, stock filter:
http://www.norcalmotorsports.org/users/bryan/mods/EVO/evo_tunes/Evo10_filterTest_042508/Stock_reflashVSnoReflash.jpg
These are the "average" of three pulls for each.
Dotted lines are before off the showroom floor, before the new "factory reflash" came to be.
Solid lines are now with the new "factory reflash"
As you can see the new reflash really smoothed everything out and also gives a nice horsepower and torque increase over the powerband.
Peak gains from the "factory reflash" are 11whp/0wtq. Horsepower and Torque area under the curve however has increased throughout.
Next we put the "final" design of our EVO X - GST Open Filter Kit on the car:
http://www.norcalmotorsports.org/users/bryan/mods/EVO/evo_tunes/Evo10_filterTest_042508/stock_vs_finalDesign.jpg
These are the "average" of three pulls for each.
Dotted lines are 100% stock Evo X.
Solid lines are with the GST Open Filter kit.
Little less total increase than before which was +22whp/+22wtq. However, the car is stronger 100% stock now from the "factory reflash" so do keep that in mind.
Peak gains from the kit are: +15whp / +13wtq. Larger increases in area under the curve do occur at around 6,000 rpm.
-------
After this I tried out a couple different things with our kit.
The first one was using a different type of cone filter. For the kit above we where using a normal open cone filter with no "velocity stack". Basically a flat top filter with the filter element on the side much like K&N open filters. I switched this out for a filter with a "velocity stack" on it, which means it also has a opening on the top of the filter that comes down like a pyramid into the filter.
http://www.norcalmotorsports.org/users/bryan/mods/EVO/evo_tunes/Evo10_filterTest_042508/stock_vs_final_VelocityStac.jpg
Dotted lines are 100% stock Evo X.
Solid lines are the GST kit with the different type of filter with "velocity stack"
The Evo X did not like this design at all. Smoothness was gone, jerky powerband and it lost peak power of -18whp / -8wtq from the stock airbox and -33whp / -21whp from the GST filter kit with other filter design above, with even larger decreases in area under the curve.
Amazing how such a small change in filter design can have such an effect. Throw this type of filter in the trash.
Next we tried this same filter with "velocity stack" and also a 45 degree silicone coupler. The idea here was to move the filter element as far away from the engine as possible, and if it worked, to re-engineer our heat shielding to work with this. It did indeed move it further away from the motor, the filter was nicely tucked behind the drivers side head light.
How did it work?
http://www.norcalmotorsports.org/users/bryan/mods/EVO/evo_tunes/Evo10_filterTest_042508/stock_vs_final_45degree.jpg
Dotted lines are 100% stock Evo X
Solid lines are the GST kit with the different type of filter with "velocity stack" and 45 degree silicone coupler.
Even worse. -23whp / -19wtq from the stock airbox with even larger decreases in area under the curve and really lumpy powerband.
What we learned with all this is the Evo X hotwire maf is very picky with the type of airflow going through it and you have to be aware of this when engineering a filter kit if you want it to work well and see gains.
We had the car we did testing on before come in again. He had recently got the "Factory reflash" from Mitsubishi for the Evo X.
Here is a new baseline for this car. 100% stock, stock airbox, stock filter:
http://www.norcalmotorsports.org/users/bryan/mods/EVO/evo_tunes/Evo10_filterTest_042508/Stock_reflashVSnoReflash.jpg
These are the "average" of three pulls for each.
Dotted lines are before off the showroom floor, before the new "factory reflash" came to be.
Solid lines are now with the new "factory reflash"
As you can see the new reflash really smoothed everything out and also gives a nice horsepower and torque increase over the powerband.
Peak gains from the "factory reflash" are 11whp/0wtq. Horsepower and Torque area under the curve however has increased throughout.
Next we put the "final" design of our EVO X - GST Open Filter Kit on the car:
http://www.norcalmotorsports.org/users/bryan/mods/EVO/evo_tunes/Evo10_filterTest_042508/stock_vs_finalDesign.jpg
These are the "average" of three pulls for each.
Dotted lines are 100% stock Evo X.
Solid lines are with the GST Open Filter kit.
Little less total increase than before which was +22whp/+22wtq. However, the car is stronger 100% stock now from the "factory reflash" so do keep that in mind.
Peak gains from the kit are: +15whp / +13wtq. Larger increases in area under the curve do occur at around 6,000 rpm.
-------
After this I tried out a couple different things with our kit.
The first one was using a different type of cone filter. For the kit above we where using a normal open cone filter with no "velocity stack". Basically a flat top filter with the filter element on the side much like K&N open filters. I switched this out for a filter with a "velocity stack" on it, which means it also has a opening on the top of the filter that comes down like a pyramid into the filter.
http://www.norcalmotorsports.org/users/bryan/mods/EVO/evo_tunes/Evo10_filterTest_042508/stock_vs_final_VelocityStac.jpg
Dotted lines are 100% stock Evo X.
Solid lines are the GST kit with the different type of filter with "velocity stack"
The Evo X did not like this design at all. Smoothness was gone, jerky powerband and it lost peak power of -18whp / -8wtq from the stock airbox and -33whp / -21whp from the GST filter kit with other filter design above, with even larger decreases in area under the curve.
Amazing how such a small change in filter design can have such an effect. Throw this type of filter in the trash.
Next we tried this same filter with "velocity stack" and also a 45 degree silicone coupler. The idea here was to move the filter element as far away from the engine as possible, and if it worked, to re-engineer our heat shielding to work with this. It did indeed move it further away from the motor, the filter was nicely tucked behind the drivers side head light.
How did it work?
http://www.norcalmotorsports.org/users/bryan/mods/EVO/evo_tunes/Evo10_filterTest_042508/stock_vs_final_45degree.jpg
Dotted lines are 100% stock Evo X
Solid lines are the GST kit with the different type of filter with "velocity stack" and 45 degree silicone coupler.
Even worse. -23whp / -19wtq from the stock airbox with even larger decreases in area under the curve and really lumpy powerband.
What we learned with all this is the Evo X hotwire maf is very picky with the type of airflow going through it and you have to be aware of this when engineering a filter kit if you want it to work well and see gains.